Construction method of external self-control building sunshade system

The invention discloses a construction method of an external self-control building sunshade system. The construction method comprises the steps of measuring, positioning and paying off, connecting andinstalling sunshade floating plates, and installing and fixing a surface cleaning and roller shutter structure to form an external sunshade system. The sunshade floating plates and the roller shutterstructure of the external sunshade system have a sunshade effect on the periphery of a building, and the power consumption of an air conditioner can be effectively reduced; the sunshade floating plates and a main body structure are connected through connecting pieces and formed at a time, the connecting quality is guaranteed, and the construction efficiency is improved; and the sunshade floatingplates are hoisted and installed through a dry operation method, water-based materials do not need to be used in the construction process, the working environment is improved, the material loss is reduced, and meanwhile the ind